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<head>
    <meta charset="UTF-8">
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    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<body>
    <script>
        /* 简单浅拷贝 */
        var arr =[1,2,3,4];
        var newArr=arr;
        newArr.push(5);
        console.log(arr); //[1,2,3,4,5]
    </script>

</body>
</html>